Chair-iron



D. R. COLLIER.

CHAIR IRON.

APPLICATION HLED NOV. 7. 1918.

Patented Apr. 13, 1920.

2 SHEETS-SHEET 1.

f707/e7vf0i D @6028. CaZZz'er D. R. COLLIER.

CHAIR IRON.

APPLICATION FILED NOV. 7 I918.

Patented Apr. 13, 1920.

2 SHEETS-SHEET 2.

DAVID R. COLLIER, OF GARDNER,

MASSACHUSETTS, ASSIGNOR TO COLLIER-KEYWORTH COMPANY, OF GARDNER, MASSACHUSETTS, A CORPORATION 6F MASSACHUSETTS.

CHAIR-IRON.

Original application filed May 2, 1918, Serial No. 232,020.

Specification of Letters Patent.

Patented Apr. 13, 1920.

Divided and this application filed. November 7,

1918. Serial No. 261,530.

To all whom it may concern:

Be it known that 1, DAVID R. Comma, a citizen of the United States, residing at Gardner, in the county of Worcester and State of Massachusetts, have invented new and useful Improvements in Chair-Irons, of which the following is a specification.

This invention has for its object to provide certain improvements in chair irons whereby strength and lightness in construction are obtained and a decrease in the cost of manufacture is effected.

Referring to the drawings,

Figure 1 represents a longitudinal section through the head and the spider when in normal position.

F ig. 2 represents a similar section with the spider tilted.

Figs. 3 and l represent sections on' the lines 33 and M respectively of Fig. 1.

Fig. 5 is a perspective view of the spindle, head and spider.

The structure, now to be described, is. except for the springs and the bolt, formed of sheet metal or drawn metal, as a. result of which lightness, durability and strength are obta-inec.

The spider, as illustrated, consists of a spreader 20, and the two angle bars 21, 21. The spreader consists of a fiat sheet metal bar having its end portions bent downwardly at right angles to the body thereof to form two arms 22, 22, inverted yoke. The extremities of the arms are reduced in width to form depending cars 23. The bars 21 of the spider have each a web or flange 24: which rests upon the spreader and a vertical web or flange 25 which is secured by rivets 26 to the side arms of the spreader. Thus each angle bar fits upon the corner of the spreader. The ends of the bars 21 are bent upwardly and outwardly and are flattened so that they n'iay be secured to the under side of a chair seat, the vertical webs being beveled at the ends.

The spider is tiltingly supported by ahead consisting of a plate 28 having upwardly bent arms 29 terminating in ears 30, and thus constituting a yoke sufficiently small to fit within the spreader. A pintle 31 passes through L pertures in the ears 23 of the spider and through the arms 29 of the head, the parts being so located that the ears 23 of the spider overlap the cars 30 of the heads and thereby constitute anand are in parallelism, when the parts are in normal positions. The ends of the pintle 31 are upset or headed over, permanently to hinge the spider and the head together.

The compression springs 32, 32, are shown as two in number, and their outer ends bear against a spring plate 33 having a marginal flange for strength and hollow bosses to extend into the end convolutions of said springs. The inner ends of the springs bear against a fixed spring angle-plate, the hori zontal web or flange 36 of which is riveted against the under side of the body of the spreader by rivets 37, and the vertical web or flange 38 of which has hollow bosses 39 to enter the inner end convolutions of said springs. This angle-plate is in length less than the distance between the side arms of the spreader (see F 3), but is long enough so that the ends of the vertical web may engage the upstanding cars 30 of the head which thus serve as stops to limit the movement of the spider in one direction about the pintle 31. The lower edges of the ends of the web or flange 38, when the spider is tilted, engage the top portions of the side arms of the head, as shown in Fig. 2, which serve as stops to limit the tilting movement of the spider in the other direction. Thus the vertical web or flange 38 plays in the angle formed by the ends of the arms 29 I and the ears 30, and is limited in its movement or stop thereby. A bolt 10, located midway between the springs 32, is passed through the plate 33 and the vertical web of the spring angleplate, and is provided at its end with a tubular nut {11. The head end of the bolt is angular in cross sections and fits a complemental aperture in the plate 33. The end of the nut bears against a cross plate 42, which is transversely curved to giv it additional strength, and the ends of which are secured to the upstanding cars 30 of the head. .1. desired, the cross plate may be n'iounted so as to tilt, and for this purpose it may have trunnions 43, located in sockets in said ears. These trunnions are alined with the median longitudinal portion of the cross plate, and their axis is shown as parallel to and in the vertical plane of the axis of the pintle 31, although this is not essential. When the spider is tilted and the spring angle-plate attached] thereto compresses the springs, the cross plate tilts on its trunnions, a certain amount of loose play between the bolt 4-0 and the web of flange 38 being permitted by the size of the aperture therein through which the bolt passes, as shown in Fig. 4-. The tubular nut 41 has a contracted inner internally-threaded end, and its outer end is waged in approximately smni-spherical form as at irl. A cross pin 45 passed through transverse holes in the outer or head portion of the nut, to form a handle by which it may be easily rotated. In forming the nut, a rolled or drawn tube, or a short length of waste tubing, is easily given the form shown by proper dies, and the inner end is tapped. An ordinary carriage bolt, as represented, may be employed.

The head is affixed upon the upper end of a tubular screw spindle 426, and, for the purpose of affording a rigid connection, there is secured between the upstanding arms 29 of the head a transverse reinforcing plate 4:7 spaced above and parallel to the body portion 28 of said head, and having down-turned ends 48 secured to the arms 29 by rivets 49. Any other expedient for reinforcing the head, such as a metal block, could be employed in lieu of the plate 47. The screw spindle d6 is formed of a flat plate having its lower end corrugated at an angle to provide the threads 50 when rolled into tubular form. his tube, thus formed, has near its upper end a head to engage the under side of the head when the tube is passed through the aperture therein. The extremity of the tube, which passes through an aperture in the reinforcing plate 47, is spun or flared over as at 51 to bind the tube rigidly to the head, the bead and the flare clamping the plates 28 and 4:7 rigidly between them. The spindle is formed inits upper portion with a longitudinal slot 52,

the length of which determines the extent of vertical adjustment of the spindle and chair seat, as explained in my application Serial No. 232,020, of which this is a division.

Having thus explained the nature of my said invention and described a way of making and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of its use, what I claim is:

1. In a chair iron, the combination with a spider having a spreader provided with depending ears, of a supporting head having upstanding ears, a pintle pivoting the ears of the spreader to the ears of the head, and an angular spring abutment plate having a horizontal flange or web aifixed to the spreader, and having a depending vertical web normally pressed against the ears of the head by the action of the springs.

2. The combination with a spider having a spreader with depending ears, a supporting head having upturned arms terminating in upstanding cars, a pintle pivoting the ears of the spreader to the ears of the sup porting head, and an angular spring abutment plate depending from said spreader by a flange extending flat against its under surface and having its ends located in the angle fo med by the ends of the arms and the ears of the spreader, whereby the tilting movement of the spider in opposite directions is limited thereby.

3. The combination with a spider having a spreader with depending ears, a supporting head having upturned arms on the head terminating in upstanding ears, a pintle pivoting the ears of the spreader to the ears of the supporting head, and an angle plate having a horizontal flange or web secured to the under face of the spreader and having a vertical web or flange bridging the said upstanding ears and normally held thereagainst by the action of the usual springs.

d. The combination with a spider having a spreader with depending ears, a supporting head having upturned arms on the head terminating in upstanding ears, a pintle pivoting the ears of the spreader to the ears of the supporting head, an angle plate having a horizontal flange or web secured to the under face of the spreader and having a vertical web or flange bridging the said upstanding ears and normally held thereagainst, an outer spring plate, an inner plate attached to the upstanding ears of the head, a bolt and a nut, the head of the bolt being engaged with one of the two last-mentioned plates and the nut being engaged with the other said plate.

5. The combination with a spider, a head, a pintle pivotally connecting the spider and head, a spring plate carried by the spider, a plate pivotally attached to the head, an outer spring plate, springs between said spring plates, a bolt extending through all three plates, a tubular nut on the bolt bearing against the plate on the head and having a handle thereon.

In testimony whereof I signature.

have affixed my DAVID R. COLLIER. 

